Connected: An Internet Encyclopedia
RFC 1521 - 7.1.2. The Text/plain subtype

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### 7.1.2. The Text/plain subtype

The primary subtype of text is "plain". This indicates plain (unformatted) text. The default Content-Type for Internet mail, "text/plain; charset=us-ascii", describes existing Internet practice. That is, it is the type of body defined by RFC 822.

No other text subtype is defined by this document.

The formal grammar for the content-type header field for text is as follows:

       text-type := "text" "/" text-subtype [";" "charset" "=" charset]

       text-subtype := "plain" / extension-token

       charset := "us-ascii"/ "iso-8859-1"/ "iso-8859-2"/ "iso-8859-3"
              / "iso-8859-4"/ "iso-8859-5"/ "iso-8859-6"/ "iso-8859-7"
              / "iso-8859-8" / "iso-8859-9" / extension-token
                        ; case insensitive

Next: 7.2. The Multipart Content-Type

Connected: An Internet Encyclopedia
RFC 1521 - 7.1.2. The Text/plain subtype